Quick Answer
U0928 means: U0928 indicates a communication failure in the vehicle's network, often affecting various electronic systems.
Can I drive with U0928? Immediate attention is recommended to avoid further electrical issues.
Common Questions
What does U0928 mean and how does it affect my car?
The U0928 code indicates a communication failure between your vehicle's electronic systems. This can lead to issues like malfunctioning lights, windows, and reduced fuel efficiency. Addressing this code promptly is crucial for maintaining vehicle performance.
What are the most common causes of U0928 and how much does it cost to fix?
Common causes include damaged wiring (40% likelihood) and malfunctioning BCMs (30% likelihood). Repair costs can range from $100 for wiring repairs to $800 for BCM replacement, depending on the severity of the issue.
Can I drive my car with U0928 or should I stop immediately?
It is not advisable to drive with a U0928 code, as it can lead to further electrical issues and potential safety hazards. It's best to diagnose and address the problem promptly.
How can I diagnose U0928 myself using GeekOBD APP?
To diagnose U0928, connect the GeekOBD APP to your vehicle’s OBD2 port, retrieve the code, and review freeze frame data to understand the circumstances leading to the fault. This information will help you pinpoint the source of the problem.
What vehicles are most commonly affected by U0928?
The U0928 code frequently appears in 2015-2018 Ford F-150 models, among others. Always check for any manufacturer recalls or TSBs related to communication issues.
How can I prevent U0928 from happening again?
Regular maintenance and inspections of the vehicle's electrical systems, as well as addressing any signs of corrosion or wear promptly, can help prevent the U0928 code from recurring.
What is U0928?
The U0928 diagnostic trouble code (DTC) is a network communication issue that indicates a problem with the vehicle's Controller Area Network (CAN) system. This code signifies that the body control module (BCM) has lost communication with one or more modules on the CAN bus. In simpler terms, if your vehicle is throwing a U0928 code, it means that there is a failure in the communication link between various electronic control units (ECUs). This can lead to a variety of issues, such as malfunctioning lights, windows, or other electronic features that rely on these communications. Commonly found in vehicles like the 2015-2018 Ford F-150, this issue may present as a check engine light or other warning indicators on the dashboard. If ignored, the persistence of this code can cause further complications, including reduced functionality of critical vehicle systems. Therefore, understanding the implications of U0928 and addressing it promptly is essential for maintaining vehicle performance and safety.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0928 is present:
- The check engine light stays on constantly, indicating a persistent issue with the vehicle's electronic control systems.
- You may notice that certain features, such as power windows or mirrors, fail to operate, which can be frustrating during daily use.
- Fuel economy may decrease by 10-15%, as the vehicle's electronic systems struggle to communicate effectively.
- Random electrical failures can occur, such as dashboard lights flickering or malfunctioning, which can be distracting and dangerous.
- If your vehicle is equipped with advanced driver assistance features, these may become disabled or unreliable due to the communication breakdown.
Possible Causes
Most common causes of U0928 (ordered by frequency):
- The most common cause of the U0928 code is damaged wiring in the CAN bus system, which is likely in 40% of cases. Over time, wear and tear or exposure to moisture can lead to shorts or breaks in the wiring.
- A malfunctioning body control module (BCM) can also trigger this code, accounting for about 30% of U0928 occurrences. This can stem from software issues or internal component failures.
- Corrosion at connectors can contribute to communication failures as well, which is a common issue in older vehicles or those exposed to harsh environments.
- Less common but serious causes include faulty electronic control units (ECUs) that may need replacement, which can be costly if multiple units are affected.
- Rarely, a complete failure of the vehicle's CAN bus may occur, requiring extensive diagnosis and potentially full harness replacement.
U0928 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repair or replace damaged wiring within the CAN bus system.
- Total: $100 - $300
- Success rate: 85%
BCM Replacement
Replace the faulty body control module that is causing communication issues.
- Total: $300 - $800
- Success rate: 90%
Money-Saving Tips for U0928
- Start with the most common and least expensive repairs first
- Use GeekOBD APP to confirm diagnosis before replacing expensive parts
- Consider preventive maintenance to avoid future occurrences
- Compare prices for OEM vs aftermarket parts based on your needs
- Address the issue promptly to prevent more expensive secondary damage
Diagnostic Steps
Professional U0928 Diagnosis Process
Follow these systematic steps to accurately diagnose U0928. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 2: Step 2
Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)
Step 3: Step 3
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the suspected components, particularly the BCM and wiring (20-30 minutes)
Step 4: Step 4
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 5: Step 5
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure all systems are operational (15-20 minutes)
Important Notes
- Always verify the repair with GeekOBD APP after completing diagnostic steps
- Clear codes and test drive to ensure the problem is resolved
- Address underlying causes to prevent code recurrence
Real Repair Case Studies
Case Study 1: U0928 Code Repair on a 2016 Ford F-150
Vehicle: 2016 Ford F-150, 75,000 miles
Problem: Customer reported intermittent failure of electrical features and check engine light.
Diagnosis: Initial scan revealed U0928 code. Visual inspection showed damaged wiring in the CAN bus.
Solution: Repaired the damaged wiring and replaced a corroded connector.
Cost: $250 (parts and labor)
Result: The check engine light was cleared, and all electrical features functioned properly post-repair.
Case Study 2: Resolving U0928 in a 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 50,000 miles
Problem: Driver experienced dashboard warning lights and non-functional power windows.
Diagnosis: OBD scan confirmed U0928 code; BCM was found to be malfunctioning.
Solution: Replaced the BCM and programmed it to the vehicle.
Cost: $600 (including BCM and programming)
Result: All systems returned to normal operation, with no further issues reported.